arm64: dts: qcom: sc7280-herobrine: Don't enable the USB 2.0 port

The USB 2.0 port of sc7280 is currently not used by any herobrine
board. Delete the device tree entries that enable it.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220826084813.1.I8c9a771fcf4d1cfb6e8e0ef17a153143af9a644d@changeid